Print Email Facebook Twitter On the dynamic nature of Mo sites for methane dehydroaromatization Title On the dynamic nature of Mo sites for methane dehydroaromatization Author Vollmer, I. (TU Delft ChemE/Catalysis Engineering) van der Linden, B. (TU Delft ChemE/O&O groep) Ould-Chikh, Samy (King Abdullah University of Science and Technology) Aguilar-Tapia, Antonio (Institute Néel) Yarulina, I. (TU Delft ChemE/Catalysis Engineering) Abou-Hamad, Edy (King Abdullah University of Science and Technology) Sneider, Yuri G. (Sapienza Universita di Roma) Olivos Suarez, A.I. (TU Delft ChemE/Catalysis Engineering) Hazemann, Jean-Louis (Institute Néel) Kapteijn, F. (TU Delft ChemE/Catalysis Engineering) Gascon, Jorge (TU Delft ChemE/Catalysis Engineering) Date 2018 Abstract The mechanism of methane activation on Mo/HZSM-5 is not yet fully understood, despite the great interest in methane dehydroaromatization (MDA) to replace aromatics production in oil refineries. It is difficult to assess the exact nature of the active site due to fast coking. By pre-carburizing Mo/HZSM-5 with carbon monoxide (CO), the MDA active site formation was isolated from coke formation. With this a clear 13C NMR signal solely from the active site and not obscured by coke was obtained, and it revealed two types of likely molecular Mo (oxy-)carbidic species in addition to the β-Mo2C nanoparticles often mentioned in the literature. Furthermore, separating the active site formation from coking by pre-carburization helped us examine how methane is activated on the catalytic site by carrying out MDA using isotopically labelled methane (13CH4). Carbon originating from the pre-formed carbide was incorporated into the main products of the reaction, ethylene and benzene, demonstrating the dynamic behavior of the (oxy-)carbidic active sites. To reference this document use: http://resolver.tudelft.nl/uuid:0a91af9a-9789-4c89-9c13-37401f17bf1d DOI https://doi.org/10.1039/C8SC01263F ISSN 2041-6520 Source Chemical Science, 4801-4807 Part of collection Institutional Repository Document type journal article Rights © 2018 I. Vollmer, B. van der Linden, Samy Ould-Chikh, Antonio Aguilar-Tapia, I. Yarulina, Edy Abou-Hamad, Yuri G. Sneider, A.I. Olivos Suarez, Jean-Louis Hazemann, F. Kapteijn, Jorge Gascon Files PDF c8sc01263f.pdf 1.59 MB Close viewer /islandora/object/uuid:0a91af9a-9789-4c89-9c13-37401f17bf1d/datastream/OBJ/view